Galaxias mcdowalli, McDowall’s Galaxias

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Galaxias mcdowalli Raadik, 2014

McDowall’s Galaxias
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drawing shows typical species in Galaxiidae.

分類 / Names 俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa

Teleostei > Galaxiiformes (Southern smelts) 胡瓜魚目 (Southern smelts) > Galaxiidae (Galaxiids) 南乳魚科 (Galaxiids) > Galaxiinae
Etymology: Galaxias: Greek, galaxias, ou = a kind of fish (Ref. 45335);  mcdowalli: Named for the late Dr Robert (Bob) Montgomery McDowall (1939-2011),.

Environment: milieu / climate zone / depth range / distribution range 生態學

; 淡水 底中水層性; 非遷移的; 深度上下限 0 - 1 m (Ref. 98815).

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Oceania: Australia.

大小 / 重量 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 8.4 cm FL 雄魚/尚未辨別雌雄; (Ref. 98815); 最大體重: 6.00 g (Ref. 98815)

簡短描述 型態特徵 | 形態測量圖

背的軟條 (總數): 8-12; 臀鰭軟條: 11 - 12; 脊椎骨: 54 - 56. This species is distinguished from all other species within the Galaxias olidus complex by the following characters: segmented pelvic fin rays 8; high vertebral count 55; head length about as long as pelvic fin to anal fin length distance; dorsal and anal fin are bases relatively long (9.9-13.0 and 11.0-12.5 % SL, respectively); snout long (27.0-33.7 % HL), post-orbital head length short (48.9-55.2 % HL); inter-orbital relatively wide (38.6-44.8 % HL); nostrils of moderate length and not visible from ventral view; pelvic fins moderately short (8.9-10.8 % SL); caudal peduncle relatively shallow (7.2–8.1 % SL), it is longer than length of caudal fin, the flanges moderately developed and longish, reaching to or anteriorly past distal end of adpressed anal fin rays; dorsal midline is usually quite broadly flat anteriorly from above pelvic fin bases; raised laminae on ventral surface of paired fins is sometimes evident though not strongly developed; gill rakers short and stout; no pyloric caecae; anal fin origin often under 0.53 distance posteriorly along dorsal fin base; no distinct black bars along lateral line (Ref. 98815).

生物學特性     字彙 (例如 epibenthic)

Facultative air-breathing in the genus (Ref. 126274); A freshwater fish that is unable to undertake diadromous migrations. It is the only species found within its restricted range. It is recorded from a cool, clear flowing, heavily shaded and shallow (0.5 m) freshwater river, 3-5 m wide, with a substrate of sand, silt and clay, and areas of cobble and pebble. The instream cover was provided by logs, branches and bank and vegetation overhang, and pools ranged from 1-2 m in depth. It was recorded at densities of 0.15-0.18 fish/m2 and was collected with the native species Shortfinned Eel and East Gippsland Spiny Crayfish (Ref. 98815).

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚


主要參考資料 Upload your references | 參考文獻 | 合作者 : Berra, Tim M. | 合作者

Raadik, T.A., 2014. Fifteen from one: a revision of the Galaxias olidus Günther, 1866 complex (Teleostei, Galaxiidae) in south-eastern Australia recognises three previously described taxa and describes 12 new species. Zootaxa 3898(1):001-198. (Ref. 98815)

IUCN 瀕危狀態 (Ref. 130435)

  極危 (CR) (A3bce; B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v)); Date assessed: 14 February 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = No PD50 data   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00490 (0.00205 - 0.01170), b=3.12 (2.91 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
營養階層 (Ref. 69278):  3.2   ±0.4 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).